Get familiar with PCB design: form an Arduino prototype to a PCB board.
Understand supplier, costs, production time
Design a PCB board with a led, an Atmega to control blinking and a power source.
Arduino prototype: [url removed, login to view]
34 freelancers are bidding on average $47 for this job
G'day, Do the bots have any idea what they are bidding on? Damned if I do. frustrated. , Seems you just need stock blink application well used by everyone.